﻿var previewBox = document.getElementById('PreviewBox');
var previewImage = document.getElementById('PreviewImage');
var previewUrl = document.getElementById('previewUrl');
var previewFrom = null;
var previewTimeoutId = null;
var loadingImg = '../Images/Loading.gif';

var maxWidth=250;
var maxHeight=250;
var checkComplete;
function getPosXY(a,offset)
{
	var p=offset?offset.slice(0):[0,0],tn;
	while(a)
	{
		tn=a.tagName.toUpperCase();
		if(tn=='IMG')
		{
			a=a.offsetParent;
			continue;
		}
		p[0]+=a.offsetLeft-(tn=="DIV"&&a.scrollLeft?a.scrollLeft:0);
		p[1]+=a.offsetTop-(tn=="DIV"&&a.scrollTop?a.scrollTop:0);
		if(tn=="BODY")
		   break;
		a=a.offsetParent;
	}
	return p;
}
function checkComplete(){
	if(checkComplete.__img&&checkComplete.__img.complete)
	   checkComplete.__onload();
}
checkComplete.__onload=function(){
	clearInterval(checkComplete.__timeId);
	var w=checkComplete.__img.width;
	var h=checkComplete.__img.height;
	if(w>=h&&w>maxWidth)
	{
		previewImage.style.width=maxWidth+'px';
	}
	else if(h>=w&&h>maxHeight)
	{
		previewImage.style.height=maxHeight+'px';
	}
	else
	{
		previewImage.style.width=previewImage.style.height='';
	}
	previewImage.src=checkComplete.__img.src;
	previewUrl.href=checkComplete.href;
	checkComplete.__img=null;
}
function showPreview(e){

	hidePreview();
	
	previewFrom=e.target||e.srcElement;
	previewImage.src=loadingImg;
	previewImage.style.width=previewImage.style.height='';
	previewTimeoutId=setTimeout('_showPreview()',500);
	checkComplete.__img=null;
	
}
function hidePreview(e){
	if(e)
	{
		var toElement=e.relatedTarget||e.toElement;
		while(toElement)
		{
			if(toElement.id=='PreviewBox')
			   return;
			toElement=toElement.parentNode;
		}
		
	}
	try{
		clearInterval(checkComplete.__timeId);
		
		checkComplete.__img=null;
		
		previewImage.src=null;
		
		
		
	}
	catch(e){}
	clearTimeout(previewTimeoutId);
	previewBox.style.display='none';
}
function _showPreview(){
  
	checkComplete.__img=new Image();
	var picLink;
	if(previewFrom.tagName.toUpperCase()=='A')
	{
	    picLink=previewFrom.getAttribute("href");
	    previewFrom=previewFrom.getElementsByTagName('img')[0];
	}
	var largeSrc=previewFrom.getAttribute("large_src");
	
	if(!largeSrc)
	    return;
	else{
		checkComplete.__img.src=largeSrc;
		checkComplete.href=picLink;
		checkComplete.__timeId=setInterval("checkComplete()",20);
		var pos=getPosXY(previewFrom,[85,-130]);
		previewBox.style.left=pos[0]+'px';
		previewBox.style.top=pos[1]+'px';
		previewBox.style.display='block';
	}
}